21162735241 has 2 divisors, whose sum is σ = 21162735242. Its totient is φ = 21162735240.

The previous prime is 21162735227. The next prime is 21162735263. The reversal of 21162735241 is 14253726112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20056507641 + 1106227600 = 141621^2 + 33260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21162735241 is a prime.

It is a super-2 number, since 2×21162735241² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21162735197 and 21162735206.

It is not a weakly prime, because it can be changed into another prime (21162715241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581367620 + 10581367621.

It is an arithmetic number, because the mean of its divisors is an integer number (10581367621).

Almost surely, 2^21162735241 is an apocalyptic number.

It is an amenable number.

21162735241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162735241 is an equidigital number, since it uses as much as digits as its factorization.

21162735241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The spelling of 21162735241 in words is "twenty-one billion, one hundred sixty-two million, seven hundred thirty-five thousand, two hundred forty-one".